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sAr Eh APPLICATION FILED DEC, 4. 1918. 1,381,935. Patented June 21, 1921.

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ALEXANDER N. SCOTT, OF CANTON, OHIO, ASSIGNOR TO THE DIEBOLD SAFE & LOCK COMPANY, OF CANTON, OHIO, A CORPORATION OF OHIO.

SAFE.

Application filed. December 4, 1918.

To all whom it may concern Be it known that I, ALEXANDER N. SCOTT, a citizen of the United States, residing at Canton, in the county of Stark, and State of Ohio, have invented a new and useful Safe, of which the following is a specification.

This invention relates to a safe or vault and has for its object the construction of a drill proof and cutting-flame proof safe. This object being accomplished by making a safe with walls of a plurality of different materials, the said materials being arranged in layers and forming an integral whole.

In the drawings:

Figure 1 is a sectional view through a completed safe construction in accordance with my process.

Fig. 2 is a sectional View through a mold box with a safe door in process of construction within the said mold box.

Similar numerals of reference indicate corresponding parts throughout the several figures of the drawings.

One of the chief objects in a constructlon of safes is to effect a construction that will resist any manner of attack by burglars, safe crackers and others who may attempt to enter the safe unlawfully. Drilling the safe and inserting a charge of nitroglycerin or other explosive which is afterward detonated is the common practice employed by safe crackers. The aim of safe builders has been to produce a material of such hardness that it will be impervious to drills and to accomplish this, manganese steel or other drill proof material has been employed. It has been found however that in producing steel of sufficient hardness to resist the attacks of the drill, the free carbon is practically eliminated from the metal. This elimination of the free carbon while producing a drill proof material, also results in producing a material whlch is susceptible to attacks by the oxy-acetylene flame. On the other hand metals which will resist the oxy-acetylene flame are susceptible to attack by a drill and it has therefore been extremely difficult to produce a safe that could not be entered unlawfully.

Various constructions have been devised such as making a safe of manganese steel and lining it with plates of non-burnable material. It has been found however that by burning a hole in the drill proof steel Specification of Letters Patent.

Patented June 21, 1921.

Serial No. 265,279.

casing, a chisel or other tool can be placed against the lining face and a sledge applied to drive the plates inwardly. Other constructions have also been employed but have been similarly unsuccessful. In the accompanying drawings I have lllustrated a safe produced by my process which safe it will be shown, is not subject to the failings above referred to. In constructing the safe according to my process what might be termed a core shown at l is first constructed of flame proof material, such as cast iron or the like. This core 1 will be placed in an ordinary mold box such as shown at 2 in Fig. 2, the core in this figure being the core for a door of the safe, such as shown in Fig. l. Manganese steel or other drill proof material 3 is then poured into the mold about the core of flame proof material thus forming a solid integral structure comprising three layers of material. hen the casting thus formed has cooled the three thicknesses of metal will become completely joined throughout. By the casting operation the walls of the core are integrally united to the cast inner and outer walls by a fused or welded zone or layer, so that separation can not possibly be effected. The three are one. It will be seen that the result accomplished is the production of a safe with a layer of drill proof material forming its exterior and interior surfaces and with a thickness of flame proof material interposed between the said layers of drill proof material. It is obvious therefore that a safe so constructed can neither be cut by the flame nor drilled to effect an entrance. It will also be seen that even though the outer shell of drill proof material is cut through by the flame, the flame proof material cannot be driven in with a chisel and sledge hammer nor even loosened sufliciently to permit an explosive charge to be inserted.

Furthermore, though the intermediate layers or core may be pierced by a drill, the drill can not get through the inner layer, nor can any hole in the core be made large: enough to permit the use of a flame on the inner layer within the time and in the circumstances under which a safe thief has to ply his trade; and the expressions flame proof and drill-proof are here used in the sense here indicated. By the expression continuous intermediate layer is meant a layer or mass of such form and so placed that any section vertical Will intersect the flame proof material, 2'. e. a burglar can not use a flame without striking the intermediate Wall somewhere.

Having fully described my invention What I claim as new and desire to secure by Letters Patent, is-

1. A safe or vault having continuous Walls, said safe consisting of a continuous integral center layer or core of flame-proof material, and cast upon and integrally united thereto on each side a layer of drill-proof material.

2. A safe or vault structure comprising three layers of metal forming the top, bottom, back and sides of the structure, each layer consisting of a continuous mass of metal; the outer and inner layers composed of drill-proof metal and the intermediate layer composed of flame-proof metal; the V. contiguous portion of the respective layers I being integrally united.

3. A safe or Vault structure comprising three layers of metal forming the top, bo't- I tom, back, sides of the structure and part of the front of the structure, said front being provided With a door aperture; each layer consisting of a continuous mass of metal; the outer and inner layers composed of drillproof metal and the intermediate layer composed of flame-proof metal; the contiguous portions of the respective layers being integrally united; and a door in said aperture consisting of a main body composed of drill-proof material and an embedded member of flame-proof material; the contiguous portion of said body and member being integrally united.

4. A safe or vault, said safe consisting of a center layer or core'of flame-proof steel and cast upon said core and continuously fused and united thereto by the act of casting, inner and outer Walls of drill-proof steel.

In testimony that I claim the above, I

. havehereunto subscribed my name.

ALEXANDER N. soon. 

